无
*注意事项:
40分钟=小时 7.3L=LmL
- = + = 1- = + = 0.42=
- = 5+ = + = - = 1- - =
① - + -
②(28+42)÷0.7
③2.5×1.2
④ + +
⑤ + -
⑥3.25×101-3.25
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